﻿/*
 * Authors:
 *   钟峰(Popeye Zhong) <zongsoft@qq.com>
 *
 * Copyright (C) 2010-2013 Zongsoft Corporation <http://www.zongsoft.com>
 *
 * This file is part of Zongsoft.Plugins.
 *
 * Zongsoft.Plugins is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Zongsoft.Plugins is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Zongsoft.Plugins; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

using System;
using System.Collections;
using System.Collections.Generic;

namespace Zongsoft.Collections.Plugins
{
	public class HasCollectionPredication : Zongsoft.Services.PredicationBase<Zongsoft.Services.Plugins.PluginPredicationContext>
	{
		public HasCollectionPredication(string name) : base(name)
		{
		}

		public override bool Predicate(Services.Plugins.PluginPredicationContext context)
		{
			if(context == null || context.Node == null)
				return false;

			var target = context.Node.UnwrapValue(Zongsoft.Plugins.ObtainMode.Never);
			ICollection collection;

			if(string.IsNullOrWhiteSpace(context.Parameter))
				collection = target as ICollection;
			else
				collection = Reflection.MemberAccess.GetMemberValue<object>(target, context.Parameter) as ICollection;

			return collection != null && collection.Count > 0;
		}
	}
}
